<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form id="formDemo" name="formDemo" action="/sysusers/modify" method="post">
    <input name="username" type="text">
    <input name="password" type="password">
    <input type="text" name="sex">
    <input type="button" onclick="send()" name="提交">
    <script type="text/javascript">
        function send() {
        }
    </script>
</form>

</body>
</html>